The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 27, 1991
Filed:
Mar. 30, 1990
Douglas A Swenson, Maplewood, MN (US);
Minnesota Mining and Manufacturing Company, St. Paul, MN (US);
Abstract
A device for stretching the width of strip material including two rotatably mounted circular pulleys having portions of their peripheries at a close spacing at a first location and portions of their peripheries at a larger spacing at a second location. Two flexible belts are mounted for movement along predetermined paths including clamping path portions with portions of the belts and pulleys in engagement from an inlet position adjacent the first location to an outlet position adjacent the second location. Edge portions of the strip material are guided between the belts and the peripheral surfaces at the inlet position and the portion of the strip material extending from the inlet position to the outlet position is clamped to the peripheral surface of the pulley by the belts and is stretched to widen its width as the pulleys rotate during movement of the strip material from the inlet position to the outlet position.